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Elastic Potential Energy and Combination of Springs

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5.4Elastic Potential Energy and Combination of Springs

Elastic Potential Energy and Combination of Springs Revision Questions

1. A 2 kg object falls from 8 m above the ground on a spring placed vertically and as a result, it compresses the spring by 4 cm. What is the value of spring constant? For simplicity, take g = 10 N/kg.

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  1. 200 000 N/m
  2. 400 000 N/m
  3. 20 N/m
  4. 40 N/m

Correct Answer: A

2. A 2 kg object starts sliding from rest down a frictionless slope of maximum height 4 m and when it reaches the bottom, it continues sliding for other 5 m along a horizontal plane by friction coefficient 0.3. Then, the object compresses a spring with constant 2000 N/m. Calculate the spring compression in cm. For simplicity, take g = 10 N/kg.

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  1. 5 cm
  2. 22 cm
  3. 62.5 cm
  4. 0.22 cm

Correct Answer: B

3. Two springs by constants 60 N/m and 300 N/m are first combined in parallel, then in series as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Elastic Potential Energy and Combination of Springs

What is the ratio kp / ks for the two total spring constants obtained in these combinations?

  1. 1
  2. 0.14
  3. 6
  4. 7.2

Correct Answer: D

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